$\int \sqrt{x^2-8 x+7} \, dx = $ . . . . . . $+ C$.

  • A
    $\frac{x-4}{2} \sqrt{x^2-8 x+7} + 9 \log \left|x-4+\sqrt{x^2-8 x+7}\right|$
  • B
    $\frac{x-4}{2} \sqrt{x^2-8 x+7} - 3 \sqrt{2} \log \left|x-4+\sqrt{x^2-8 x+7}\right|$
  • C
    $\frac{x+4}{2} \sqrt{x^2-8 x+7} + 9 \log \left|x+4+\sqrt{x^2-8 x+7}\right|$
  • D
    $\frac{x-4}{2} \sqrt{x^2-8 x+7} - \frac{9}{2} \log \left|x-4+\sqrt{x^2-8 x+7}\right|$

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